Please forgive me if this is a common question. I did do some searching, but didn't find an answer to my question.

I have several machines using ATI video cards and one with NVIDIA. The NVIDIA machine cranks through work units like mad (less than 10 minutes per unit) since it's able to use CUDA processes. My understanding (which might be mistaken) is I should be able to do the same with the ATI machines. I've updated drivers and installed the latest BOINC, without any luck. One machine is running multiple cards in a crossfire configuration and I'd love to take advantage of it's abilities.

Am I missing something? Any help or direction would be appreciated.
Thanks

Thanks for the quick response Arkayn,
I've checked the preferences as suggested, but had the defaults set which included ATI GPU use.
You mentioned "stock apps". I'd be willing to move to other configurations/apps if needed or maybe I'm missing something.

Also as a further check I confirmed I have two NVIDIA machines using GPU, but 4-5 different ATI machines not using GPU.
Thanks again for your help

Looking at your list, you only have one machine that lists a GPU that I think should be running GPU tasks (6602320). The only other other machine that lists an ATI GPU has a 4xxx GPU which, as I understand it, isn't capable of GPU tasks.

My knowledge is limited, so I can't offer any solution to why your 5x00 isn't doing GPU tasks, other than SETI is s.l.o.w. sending out tasks and frequently doesn't have any available. Have you looked at your event log to see if BOINC is even requesting GPU tasks for it? The entries would look something like this: